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1dffcc66 DD |
1 | /* Utility to pick a temporary filename prefix. |
2 | Copyright (C) 1996, 1997, 1998, 2001 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of the libiberty library. | |
5 | Libiberty is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2 of the License, or (at your option) any later version. | |
9 | ||
10 | Libiberty is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with libiberty; see the file COPYING.LIB. If not, | |
979c05d3 NC |
17 | write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
18 | Boston, MA 02110-1301, USA. */ | |
1dffcc66 DD |
19 | |
20 | #ifdef HAVE_CONFIG_H | |
21 | #include "config.h" | |
22 | #endif | |
23 | ||
24 | #include <stdio.h> /* May get P_tmpdir. */ | |
25 | #include <sys/types.h> | |
f562800d | 26 | #include <errno.h> |
1dffcc66 DD |
27 | #ifdef HAVE_UNISTD_H |
28 | #include <unistd.h> | |
29 | #endif | |
30 | #ifdef HAVE_STDLIB_H | |
31 | #include <stdlib.h> | |
32 | #endif | |
33 | #ifdef HAVE_STRING_H | |
34 | #include <string.h> | |
35 | #endif | |
36 | #ifdef HAVE_SYS_FILE_H | |
37 | #include <sys/file.h> /* May get R_OK, etc. on some systems. */ | |
38 | #endif | |
3ca747ab DD |
39 | #if defined(_WIN32) && !defined(__CYGWIN__) |
40 | #include <windows.h> | |
41 | #endif | |
1dffcc66 DD |
42 | |
43 | #ifndef R_OK | |
44 | #define R_OK 4 | |
45 | #define W_OK 2 | |
46 | #define X_OK 1 | |
47 | #endif | |
48 | ||
49 | #include "libiberty.h" | |
49b1fae4 | 50 | extern int mkstemps (char *, int); |
1dffcc66 DD |
51 | |
52 | /* '/' works just fine on MS-DOS based systems. */ | |
53 | #ifndef DIR_SEPARATOR | |
54 | #define DIR_SEPARATOR '/' | |
55 | #endif | |
56 | ||
57 | /* Name of temporary file. | |
58 | mktemp requires 6 trailing X's. */ | |
59 | #define TEMP_FILE "ccXXXXXX" | |
60 | #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1) | |
61 | ||
3ca747ab DD |
62 | #if !defined(_WIN32) || defined(__CYGWIN__) |
63 | ||
1dffcc66 DD |
64 | /* Subroutine of choose_tmpdir. |
65 | If BASE is non-NULL, return it. | |
66 | Otherwise it checks if DIR is a usable directory. | |
67 | If success, DIR is returned. | |
68 | Otherwise NULL is returned. */ | |
69 | ||
abf6a75b | 70 | static inline const char *try_dir (const char *, const char *); |
1dffcc66 | 71 | |
d9697354 | 72 | static inline const char * |
abf6a75b | 73 | try_dir (const char *dir, const char *base) |
1dffcc66 DD |
74 | { |
75 | if (base != 0) | |
76 | return base; | |
77 | if (dir != 0 | |
78 | && access (dir, R_OK | W_OK | X_OK) == 0) | |
79 | return dir; | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
84 | static const char usrtmp[] = | |
85 | { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
86 | static const char vartmp[] = | |
87 | { DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; | |
88 | ||
3ca747ab DD |
89 | #endif |
90 | ||
1dffcc66 DD |
91 | static char *memoized_tmpdir; |
92 | ||
ba19b94f DD |
93 | /* |
94 | ||
95 | @deftypefn Replacement char* choose_tmpdir () | |
96 | ||
97 | Returns a pointer to a directory path suitable for creating temporary | |
98 | files in. | |
99 | ||
100 | @end deftypefn | |
101 | ||
102 | */ | |
103 | ||
1dffcc66 | 104 | char * |
49b1fae4 | 105 | choose_tmpdir (void) |
1dffcc66 | 106 | { |
3ca747ab DD |
107 | if (!memoized_tmpdir) |
108 | { | |
109 | #if !defined(_WIN32) || defined(__CYGWIN__) | |
110 | const char *base = 0; | |
111 | char *tmpdir; | |
112 | unsigned int len; | |
113 | ||
114 | base = try_dir (getenv ("TMPDIR"), base); | |
115 | base = try_dir (getenv ("TMP"), base); | |
116 | base = try_dir (getenv ("TEMP"), base); | |
117 | ||
1dffcc66 | 118 | #ifdef P_tmpdir |
3ca747ab | 119 | base = try_dir (P_tmpdir, base); |
1dffcc66 DD |
120 | #endif |
121 | ||
3ca747ab DD |
122 | /* Try /var/tmp, /usr/tmp, then /tmp. */ |
123 | base = try_dir (vartmp, base); | |
124 | base = try_dir (usrtmp, base); | |
125 | base = try_dir (tmp, base); | |
126 | ||
127 | /* If all else fails, use the current directory! */ | |
128 | if (base == 0) | |
129 | base = "."; | |
130 | /* Append DIR_SEPARATOR to the directory we've chosen | |
131 | and return it. */ | |
132 | len = strlen (base); | |
133 | tmpdir = XNEWVEC (char, len + 2); | |
134 | strcpy (tmpdir, base); | |
135 | tmpdir[len] = DIR_SEPARATOR; | |
136 | tmpdir[len+1] = '\0'; | |
137 | memoized_tmpdir = tmpdir; | |
138 | #else /* defined(_WIN32) && !defined(__CYGWIN__) */ | |
139 | DWORD len; | |
140 | ||
141 | /* Figure out how much space we need. */ | |
142 | len = GetTempPath(0, NULL); | |
143 | if (len) | |
144 | { | |
145 | memoized_tmpdir = XNEWVEC (char, len); | |
146 | if (!GetTempPath(len, memoized_tmpdir)) | |
147 | { | |
148 | XDELETEVEC (memoized_tmpdir); | |
149 | memoized_tmpdir = NULL; | |
150 | } | |
151 | } | |
152 | if (!memoized_tmpdir) | |
153 | /* If all else fails, use the current directory. */ | |
154 | memoized_tmpdir = xstrdup (".\\"); | |
155 | #endif /* defined(_WIN32) && !defined(__CYGWIN__) */ | |
156 | } | |
157 | ||
158 | return memoized_tmpdir; | |
1dffcc66 DD |
159 | } |
160 | ||
ba19b94f DD |
161 | /* |
162 | ||
163 | @deftypefn Replacement char* make_temp_file (const char *@var{suffix}) | |
164 | ||
165 | Return a temporary file name (as a string) or @code{NULL} if unable to | |
166 | create one. @var{suffix} is a suffix to append to the file name. The | |
5d852400 | 167 | string is @code{malloc}ed, and the temporary file has been created. |
ba19b94f DD |
168 | |
169 | @end deftypefn | |
170 | ||
171 | */ | |
1dffcc66 DD |
172 | |
173 | char * | |
49b1fae4 | 174 | make_temp_file (const char *suffix) |
1dffcc66 DD |
175 | { |
176 | const char *base = choose_tmpdir (); | |
177 | char *temp_filename; | |
178 | int base_len, suffix_len; | |
179 | int fd; | |
180 | ||
181 | if (suffix == 0) | |
182 | suffix = ""; | |
183 | ||
184 | base_len = strlen (base); | |
185 | suffix_len = strlen (suffix); | |
186 | ||
abf6a75b | 187 | temp_filename = XNEWVEC (char, base_len |
1dffcc66 DD |
188 | + TEMP_FILE_LEN |
189 | + suffix_len + 1); | |
190 | strcpy (temp_filename, base); | |
191 | strcpy (temp_filename + base_len, TEMP_FILE); | |
192 | strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix); | |
193 | ||
194 | fd = mkstemps (temp_filename, suffix_len); | |
f562800d | 195 | /* Mkstemps failed. It may be EPERM, ENOSPC etc. */ |
1dffcc66 | 196 | if (fd == -1) |
f562800d DD |
197 | { |
198 | fprintf (stderr, "Cannot create temporary file in %s: %s\n", | |
199 | base, strerror (errno)); | |
200 | abort (); | |
201 | } | |
202 | /* We abort on failed close out of sheer paranoia. */ | |
1dffcc66 DD |
203 | if (close (fd)) |
204 | abort (); | |
205 | return temp_filename; | |
206 | } |